We're dividing 54321921 by 627 
The aim is to understand the frequency of 627 in 54321921.

On to step 1:
If we divide 5 by 627, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 627

Advancing to step 2:
627 goes into 54 0 times with a remainder of 54.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 54 to get 54.
Grab the next digit (3) from the dividend, add it to 54, then carry on: 543 / 627

Going ahead to step 3:
543 divided by 627 is 0 with a remainder of 543.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 543 to get 543.
Bring next digit (2) of the dividend behind the 543 and repeat the process: 5432 / 627

Advancing to step 4:
5432 divided by 627 is 8 with a remainder of 416.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 5016 away from 5432, we end up with 416.
Bring next digit (1) of the dividend behind the 416 and repeat the process: 4161 / 627

Step 5:
4161 divided by 627 is 6 with a remainder of 399.
Put 6 as the next digit of the answer. 
Result so far: 86.0
If we take 3762 away from 4161, we end up with 399.
Bring next digit (9) of the dividend behind the 399 and repeat the process: 3999 / 627

Going ahead to step 6:
If we divide 3999 by 627, we get 6 and a remainder of 237.
The number 6 becomes the next digit in our result. 
Result so far: 866.0
Subtracting 3762 from 3999 leaves us with 237.
Include the next digit (2) from the dividend after 237, then repeat: 2372 / 627

Going ahead to step 7:
627 goes into 2372 3 times with a remainder of 491.
The number 3 becomes the next digit in our result. 
Result so far: 8663.0
If we subtract 1881 from 2372, we get 491.
Grab the next digit (1) from the dividend, add it to 491, then carry on: 4911 / 627

Step 8:
If we divide 4911 by 627, we get 7 and a remainder of 522.
The number 7 becomes the next digit in our result. 
Result so far: 86637.0
If we subtract 4389 from 4911, we get 522.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

On to step 9:
When dividing 5220 by 627, we get 8 with a remainder of 204.
The number 8 becomes the next digit in our result. 
Result so far: 86637.8
If we subtract 5016 from 5220, we get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Let's proceed to step 10:
When dividing 2040 by 627, we get 3 with a remainder of 159.
The number 3 becomes the next digit in our result. 
Result so far: 86637.83
Subtracting 1881 from 2040 leaves us with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Step 11:
1590 divided by 627 is 2 with a remainder of 336.
The number 2 becomes the next digit in our result. 
Result so far: 86637.832
If we subtract 1254 from 1590, we get 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Going ahead to step 12:
When dividing 3360 by 627, we get 5 with a remainder of 225.
Record the quotient 5 as the next digit in the result. 
Result so far: 86637.8325
Subtracting 3135 from 3360 leaves us with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Going ahead to step 13:
627 can be fit into 2250 3 times, resulting in a remainder of 369.
Write down 3 as next digit of the result. 
Result so far: 86637.83253
Deduct 1881 from 2250 and we're left with 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

Advancing to step 14:
If we divide 3690 by 627, we get 5 and a remainder of 555.
Write down 5 as next digit of the result. 
Result so far: 86637.832535
Subtract 3135 from 3690 to get 555.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5550, and continue the process.

Step 15:
5550 divided by 627 is 8 with a remainder of 534.
Use 8 as the next digit of our solution. 
Result so far: 86637.8325358
Subtracting 5016 from 5550 leaves us with 534.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5340, and continue the process.

On to step 16:
When dividing 5340 by 627, we get 8 with a remainder of 324.
The next digit of our result is 8. 
Result so far: 86637.83253588
Subtract 5016 from 5340 to get 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

The final outcome is 86637.83253588, with a leftover of 3.24e-07.